From da76459dc21b5af2449af2d36eb95226cb186ce2 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 11:35:11 +0200 Subject: Adding upstream version 2.6.12. Signed-off-by: Daniel Baumann --- src/sink.c | 1434 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1434 insertions(+) create mode 100644 src/sink.c (limited to 'src/sink.c') diff --git a/src/sink.c b/src/sink.c new file mode 100644 index 0000000..6dbda87 --- /dev/null +++ b/src/sink.c @@ -0,0 +1,1434 @@ +/* + * Event sink management + * + * Copyright (C) 2000-2019 Willy Tarreau - w@1wt.eu + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation, version 2.1 + * exclusively. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct list sink_list = LIST_HEAD_INIT(sink_list); + +/* sink proxies list */ +struct proxy *sink_proxies_list; + +struct sink *cfg_sink; + +struct sink *sink_find(const char *name) +{ + struct sink *sink; + + list_for_each_entry(sink, &sink_list, sink_list) + if (strcmp(sink->name, name) == 0) + return sink; + return NULL; +} + +/* creates a new sink and adds it to the list, it's still generic and not fully + * initialized. Returns NULL on allocation failure. If another one already + * exists with the same name, it will be returned. The caller can detect it as + * a newly created one has type SINK_TYPE_NEW. + */ +static struct sink *__sink_new(const char *name, const char *desc, int fmt) +{ + struct sink *sink; + + sink = sink_find(name); + if (sink) + goto end; + + sink = calloc(1, sizeof(*sink)); + if (!sink) + goto end; + + sink->name = strdup(name); + if (!sink->name) + goto err; + + sink->desc = strdup(desc); + if (!sink->desc) + goto err; + + sink->fmt = fmt; + sink->type = SINK_TYPE_NEW; + sink->maxlen = BUFSIZE; + /* address will be filled by the caller if needed */ + sink->ctx.fd = -1; + sink->ctx.dropped = 0; + HA_RWLOCK_INIT(&sink->ctx.lock); + LIST_APPEND(&sink_list, &sink->sink_list); + end: + return sink; + + err: + ha_free(&sink->name); + ha_free(&sink->desc); + ha_free(&sink); + + return NULL; +} + +/* creates a sink called of type FD associated to fd , format , + * and description . Returns NULL on allocation failure or conflict. + * Perfect duplicates are merged (same type, fd, and name). + */ +struct sink *sink_new_fd(const char *name, const char *desc, enum log_fmt fmt, int fd) +{ + struct sink *sink; + + sink = __sink_new(name, desc, fmt); + if (!sink || (sink->type == SINK_TYPE_FD && sink->ctx.fd == fd)) + goto end; + + if (sink->type != SINK_TYPE_NEW) { + sink = NULL; + goto end; + } + + sink->type = SINK_TYPE_FD; + sink->ctx.fd = fd; + end: + return sink; +} + +/* creates a sink called of type BUF of size , format , + * and description . Returns NULL on allocation failure or conflict. + * Perfect duplicates are merged (same type and name). If sizes differ, the + * largest one is kept. + */ +struct sink *sink_new_buf(const char *name, const char *desc, enum log_fmt fmt, size_t size) +{ + struct sink *sink; + + sink = __sink_new(name, desc, fmt); + if (!sink) + goto fail; + + if (sink->type == SINK_TYPE_BUFFER) { + /* such a buffer already exists, we may have to resize it */ + if (!ring_resize(sink->ctx.ring, size)) + goto fail; + goto end; + } + + if (sink->type != SINK_TYPE_NEW) { + /* already exists of another type */ + goto fail; + } + + sink->ctx.ring = ring_new(size); + if (!sink->ctx.ring) { + LIST_DELETE(&sink->sink_list); + free(sink->name); + free(sink->desc); + free(sink); + goto fail; + } + + sink->type = SINK_TYPE_BUFFER; + end: + return sink; + fail: + return NULL; +} + +/* tries to send message parts (up to 8, ignored above) from message + * array to sink . Formatting according to the sink's preference is + * done here. Lost messages are NOT accounted for. It is preferable to call + * sink_write() instead which will also try to emit the number of dropped + * messages when there are any. It returns >0 if it could write anything, + * <=0 otherwise. + */ + ssize_t __sink_write(struct sink *sink, const struct ist msg[], size_t nmsg, + int level, int facility, struct ist *metadata) + { + struct ist *pfx = NULL; + size_t npfx = 0; + + if (sink->fmt == LOG_FORMAT_RAW) + goto send; + + pfx = build_log_header(sink->fmt, level, facility, metadata, &npfx); + +send: + if (sink->type == SINK_TYPE_FD) { + return fd_write_frag_line(sink->ctx.fd, sink->maxlen, pfx, npfx, msg, nmsg, 1); + } + else if (sink->type == SINK_TYPE_BUFFER) { + return ring_write(sink->ctx.ring, sink->maxlen, pfx, npfx, msg, nmsg); + } + return 0; +} + +/* Tries to emit a message indicating the number of dropped events. In case of + * success, the amount of drops is reduced by as much. It's supposed to be + * called under an exclusive lock on the sink to avoid multiple produces doing + * the same. On success, >0 is returned, otherwise <=0 on failure. + */ +int sink_announce_dropped(struct sink *sink, int facility) +{ + static THREAD_LOCAL struct ist metadata[LOG_META_FIELDS]; + static THREAD_LOCAL pid_t curr_pid; + static THREAD_LOCAL char pidstr[16]; + unsigned int dropped; + struct buffer msg; + struct ist msgvec[1]; + char logbuf[64]; + + while (unlikely((dropped = sink->ctx.dropped) > 0)) { + chunk_init(&msg, logbuf, sizeof(logbuf)); + chunk_printf(&msg, "%u event%s dropped", dropped, dropped > 1 ? "s" : ""); + msgvec[0] = ist2(msg.area, msg.data); + + if (!metadata[LOG_META_HOST].len) { + if (global.log_send_hostname) + metadata[LOG_META_HOST] = ist(global.log_send_hostname); + } + + if (!metadata[LOG_META_TAG].len) + metadata[LOG_META_TAG] = ist2(global.log_tag.area, global.log_tag.data); + + if (unlikely(curr_pid != getpid())) + metadata[LOG_META_PID].len = 0; + + if (!metadata[LOG_META_PID].len) { + curr_pid = getpid(); + ltoa_o(curr_pid, pidstr, sizeof(pidstr)); + metadata[LOG_META_PID] = ist2(pidstr, strlen(pidstr)); + } + + if (__sink_write(sink, msgvec, 1, LOG_NOTICE, facility, metadata) <= 0) + return 0; + /* success! */ + HA_ATOMIC_SUB(&sink->ctx.dropped, dropped); + } + return 1; +} + +/* parse the "show events" command, returns 1 if a message is returned, otherwise zero */ +static int cli_parse_show_events(char **args, char *payload, struct appctx *appctx, void *private) +{ + struct sink *sink; + uint ring_flags; + int arg; + + args++; // make args[1] the 1st arg + + if (!*args[1]) { + /* no arg => report the list of supported sink */ + chunk_printf(&trash, "Supported events sinks are listed below. Add -w(wait), -n(new). Any key to stop\n"); + list_for_each_entry(sink, &sink_list, sink_list) { + chunk_appendf(&trash, " %-10s : type=%s, %u dropped, %s\n", + sink->name, + sink->type == SINK_TYPE_NEW ? "init" : + sink->type == SINK_TYPE_FD ? "fd" : + sink->type == SINK_TYPE_BUFFER ? "buffer" : "?", + sink->ctx.dropped, sink->desc); + } + + trash.area[trash.data] = 0; + return cli_msg(appctx, LOG_WARNING, trash.area); + } + + if (!cli_has_level(appctx, ACCESS_LVL_OPER)) + return 1; + + sink = sink_find(args[1]); + if (!sink) + return cli_err(appctx, "No such event sink"); + + if (sink->type != SINK_TYPE_BUFFER) + return cli_msg(appctx, LOG_NOTICE, "Nothing to report for this sink"); + + ring_flags = 0; + for (arg = 2; *args[arg]; arg++) { + if (strcmp(args[arg], "-w") == 0) + ring_flags |= RING_WF_WAIT_MODE; + else if (strcmp(args[arg], "-n") == 0) + ring_flags |= RING_WF_SEEK_NEW; + else if (strcmp(args[arg], "-nw") == 0 || strcmp(args[arg], "-wn") == 0) + ring_flags |= RING_WF_WAIT_MODE | RING_WF_SEEK_NEW; + else + return cli_err(appctx, "unknown option"); + } + return ring_attach_cli(sink->ctx.ring, appctx, ring_flags); +} + +/* Pre-configures a ring proxy to emit connections */ +void sink_setup_proxy(struct proxy *px) +{ + px->last_change = now.tv_sec; + px->cap = PR_CAP_BE; + px->maxconn = 0; + px->conn_retries = 1; + px->timeout.server = TICK_ETERNITY; + px->timeout.client = TICK_ETERNITY; + px->timeout.connect = TICK_ETERNITY; + px->accept = NULL; + px->options2 |= PR_O2_INDEPSTR | PR_O2_SMARTCON | PR_O2_SMARTACC; + px->next = sink_proxies_list; + sink_proxies_list = px; +} + +/* + * IO Handler to handle message push to syslog tcp server. + * It takes its context from appctx->svcctx. + */ +static void sink_forward_io_handler(struct appctx *appctx) +{ + struct stconn *sc = appctx_sc(appctx); + struct stream *s = __sc_strm(sc); + struct sink *sink = strm_fe(s)->parent; + struct sink_forward_target *sft = appctx->svcctx; + struct ring *ring = sink->ctx.ring; + struct buffer *buf = &ring->buf; + uint64_t msg_len; + size_t len, cnt, ofs, last_ofs; + int ret = 0; + + /* if stopping was requested, close immediately */ + if (unlikely(stopping)) + goto close; + + /* for rex because it seems reset to timeout + * and we don't want expire on this case + * with a syslog server + */ + sc_oc(sc)->rex = TICK_ETERNITY; + /* rto should not change but it seems the case */ + sc_oc(sc)->rto = TICK_ETERNITY; + + /* an error was detected */ + if (unlikely(sc_ic(sc)->flags & (CF_WRITE_ERROR|CF_SHUTW))) + goto close; + + /* con closed by server side */ + if ((sc_oc(sc)->flags & CF_SHUTW)) + goto close; + + /* if the connection is not established, inform the stream that we want + * to be notified whenever the connection completes. + */ + if (sc_opposite(sc)->state < SC_ST_EST) { + applet_need_more_data(appctx); + se_need_remote_conn(appctx->sedesc); + applet_have_more_data(appctx); + return; + } + + HA_SPIN_LOCK(SFT_LOCK, &sft->lock); + if (appctx != sft->appctx) { + HA_SPIN_UNLOCK(SFT_LOCK, &sft->lock); + goto close; + } + ofs = sft->ofs; + + HA_RWLOCK_WRLOCK(LOGSRV_LOCK, &ring->lock); + LIST_DEL_INIT(&appctx->wait_entry); + HA_RWLOCK_WRUNLOCK(LOGSRV_LOCK, &ring->lock); + + HA_RWLOCK_RDLOCK(LOGSRV_LOCK, &ring->lock); + + /* explanation for the initialization below: it would be better to do + * this in the parsing function but this would occasionally result in + * dropped events because we'd take a reference on the oldest message + * and keep it while being scheduled. Thus instead let's take it the + * first time we enter here so that we have a chance to pass many + * existing messages before grabbing a reference to a location. This + * value cannot be produced after initialization. + */ + if (unlikely(ofs == ~0)) { + ofs = 0; + + HA_ATOMIC_INC(b_peek(buf, ofs)); + ofs += ring->ofs; + } + + /* in this loop, ofs always points to the counter byte that precedes + * the message so that we can take our reference there if we have to + * stop before the end (ret=0). + */ + if (sc_opposite(sc)->state == SC_ST_EST) { + /* we were already there, adjust the offset to be relative to + * the buffer's head and remove us from the counter. + */ + ofs -= ring->ofs; + BUG_ON(ofs >= buf->size); + HA_ATOMIC_DEC(b_peek(buf, ofs)); + + ret = 1; + while (ofs + 1 < b_data(buf)) { + cnt = 1; + len = b_peek_varint(buf, ofs + cnt, &msg_len); + if (!len) + break; + cnt += len; + BUG_ON(msg_len + ofs + cnt + 1 > b_data(buf)); + + if (unlikely(msg_len + 1 > b_size(&trash))) { + /* too large a message to ever fit, let's skip it */ + ofs += cnt + msg_len; + continue; + } + + chunk_reset(&trash); + len = b_getblk(buf, trash.area, msg_len, ofs + cnt); + trash.data += len; + trash.area[trash.data++] = '\n'; + + if (applet_putchk(appctx, &trash) == -1) { + ret = 0; + break; + } + ofs += cnt + msg_len; + } + + HA_ATOMIC_INC(b_peek(buf, ofs)); + ofs += ring->ofs; + sft->ofs = ofs; + last_ofs = ring->ofs; + } + HA_RWLOCK_RDUNLOCK(LOGSRV_LOCK, &ring->lock); + + if (ret) { + /* let's be woken up once new data arrive */ + HA_RWLOCK_WRLOCK(LOGSRV_LOCK, &ring->lock); + LIST_APPEND(&ring->waiters, &appctx->wait_entry); + ofs = ring->ofs; + HA_RWLOCK_WRUNLOCK(LOGSRV_LOCK, &ring->lock); + if (ofs != last_ofs) { + /* more data was added into the ring between the + * unlock and the lock, and the writer might not + * have seen us. We need to reschedule a read. + */ + applet_have_more_data(appctx); + } else + applet_have_no_more_data(appctx); + } + HA_SPIN_UNLOCK(SFT_LOCK, &sft->lock); + + /* always drain data from server */ + co_skip(sc_oc(sc), sc_oc(sc)->output); + return; + +close: + sc_shutw(sc); + sc_shutr(sc); + sc_ic(sc)->flags |= CF_READ_NULL; +} + +/* + * IO Handler to handle message push to syslog tcp server + * using octet counting frames + * It takes its context from appctx->svcctx. + */ +static void sink_forward_oc_io_handler(struct appctx *appctx) +{ + struct stconn *sc = appctx_sc(appctx); + struct stream *s = __sc_strm(sc); + struct sink *sink = strm_fe(s)->parent; + struct sink_forward_target *sft = appctx->svcctx; + struct ring *ring = sink->ctx.ring; + struct buffer *buf = &ring->buf; + uint64_t msg_len; + size_t len, cnt, ofs; + int ret = 0; + char *p; + + /* if stopping was requested, close immediately */ + if (unlikely(stopping)) + goto close; + + /* for rex because it seems reset to timeout + * and we don't want expire on this case + * with a syslog server + */ + sc_oc(sc)->rex = TICK_ETERNITY; + /* rto should not change but it seems the case */ + sc_oc(sc)->rto = TICK_ETERNITY; + + /* an error was detected */ + if (unlikely(sc_ic(sc)->flags & (CF_WRITE_ERROR|CF_SHUTW))) + goto close; + + /* con closed by server side */ + if ((sc_oc(sc)->flags & CF_SHUTW)) + goto close; + + /* if the connection is not established, inform the stream that we want + * to be notified whenever the connection completes. + */ + if (sc_opposite(sc)->state < SC_ST_EST) { + applet_need_more_data(appctx); + se_need_remote_conn(appctx->sedesc); + applet_have_more_data(appctx); + return; + } + + HA_SPIN_LOCK(SFT_LOCK, &sft->lock); + if (appctx != sft->appctx) { + HA_SPIN_UNLOCK(SFT_LOCK, &sft->lock); + goto close; + } + ofs = sft->ofs; + + HA_RWLOCK_WRLOCK(LOGSRV_LOCK, &ring->lock); + LIST_DEL_INIT(&appctx->wait_entry); + HA_RWLOCK_WRUNLOCK(LOGSRV_LOCK, &ring->lock); + + HA_RWLOCK_RDLOCK(LOGSRV_LOCK, &ring->lock); + + /* explanation for the initialization below: it would be better to do + * this in the parsing function but this would occasionally result in + * dropped events because we'd take a reference on the oldest message + * and keep it while being scheduled. Thus instead let's take it the + * first time we enter here so that we have a chance to pass many + * existing messages before grabbing a reference to a location. This + * value cannot be produced after initialization. + */ + if (unlikely(ofs == ~0)) { + ofs = 0; + + HA_ATOMIC_INC(b_peek(buf, ofs)); + ofs += ring->ofs; + } + + /* in this loop, ofs always points to the counter byte that precedes + * the message so that we can take our reference there if we have to + * stop before the end (ret=0). + */ + if (sc_opposite(sc)->state == SC_ST_EST) { + /* we were already there, adjust the offset to be relative to + * the buffer's head and remove us from the counter. + */ + ofs -= ring->ofs; + BUG_ON(ofs >= buf->size); + HA_ATOMIC_DEC(b_peek(buf, ofs)); + + ret = 1; + while (ofs + 1 < b_data(buf)) { + cnt = 1; + len = b_peek_varint(buf, ofs + cnt, &msg_len); + if (!len) + break; + cnt += len; + BUG_ON(msg_len + ofs + cnt + 1 > b_data(buf)); + + chunk_reset(&trash); + p = ulltoa(msg_len, trash.area, b_size(&trash)); + if (p) { + trash.data = (p - trash.area) + 1; + *p = ' '; + } + + if (!p || (trash.data + msg_len > b_size(&trash))) { + /* too large a message to ever fit, let's skip it */ + ofs += cnt + msg_len; + continue; + } + + trash.data += b_getblk(buf, p + 1, msg_len, ofs + cnt); + + if (applet_putchk(appctx, &trash) == -1) { + ret = 0; + break; + } + ofs += cnt + msg_len; + } + + HA_ATOMIC_INC(b_peek(buf, ofs)); + ofs += ring->ofs; + sft->ofs = ofs; + } + HA_RWLOCK_RDUNLOCK(LOGSRV_LOCK, &ring->lock); + + if (ret) { + /* let's be woken up once new data arrive */ + HA_RWLOCK_WRLOCK(LOGSRV_LOCK, &ring->lock); + LIST_APPEND(&ring->waiters, &appctx->wait_entry); + HA_RWLOCK_WRUNLOCK(LOGSRV_LOCK, &ring->lock); + applet_have_no_more_data(appctx); + } + HA_SPIN_UNLOCK(SFT_LOCK, &sft->lock); + + /* always drain data from server */ + co_skip(sc_oc(sc), sc_oc(sc)->output); + return; + +close: + sc_shutw(sc); + sc_shutr(sc); + sc_ic(sc)->flags |= CF_READ_NULL; +} + +void __sink_forward_session_deinit(struct sink_forward_target *sft) +{ + struct stream *s = appctx_strm(sft->appctx); + struct sink *sink; + + sink = strm_fe(s)->parent; + if (!sink) + return; + + HA_RWLOCK_WRLOCK(LOGSRV_LOCK, &sink->ctx.ring->lock); + LIST_DEL_INIT(&sft->appctx->wait_entry); + HA_RWLOCK_WRUNLOCK(LOGSRV_LOCK, &sink->ctx.ring->lock); + + sft->appctx = NULL; + task_wakeup(sink->forward_task, TASK_WOKEN_MSG); +} + +static int sink_forward_session_init(struct appctx *appctx) +{ + struct sink_forward_target *sft = appctx->svcctx; + struct stream *s; + struct sockaddr_storage *addr = NULL; + + if (!sockaddr_alloc(&addr, &sft->srv->addr, sizeof(sft->srv->addr))) + goto out_error; + + if (appctx_finalize_startup(appctx, sft->sink->forward_px, &BUF_NULL) == -1) + goto out_free_addr; + + s = appctx_strm(appctx); + s->scb->dst = addr; + s->scb->flags |= SC_FL_NOLINGER; + + s->target = &sft->srv->obj_type; + s->flags = SF_ASSIGNED; + + s->do_log = NULL; + s->uniq_id = 0; + + s->res.flags |= CF_READ_DONTWAIT; + /* for rto and rex to eternity to not expire on idle recv: + * We are using a syslog server. + */ + s->res.rto = TICK_ETERNITY; + s->res.rex = TICK_ETERNITY; + sft->appctx = appctx; + + return 0; + + out_free_addr: + sockaddr_free(&addr); + out_error: + return -1; +} + +static void sink_forward_session_release(struct appctx *appctx) +{ + struct sink_forward_target *sft = appctx->svcctx; + + if (!sft) + return; + + HA_SPIN_LOCK(SFT_LOCK, &sft->lock); + if (sft->appctx == appctx) + __sink_forward_session_deinit(sft); + HA_SPIN_UNLOCK(SFT_LOCK, &sft->lock); +} + +static struct applet sink_forward_applet = { + .obj_type = OBJ_TYPE_APPLET, + .name = "", /* used for logging */ + .fct = sink_forward_io_handler, + .init = sink_forward_session_init, + .release = sink_forward_session_release, +}; + +static struct applet sink_forward_oc_applet = { + .obj_type = OBJ_TYPE_APPLET, + .name = "", /* used for logging */ + .fct = sink_forward_oc_io_handler, + .init = sink_forward_session_init, + .release = sink_forward_session_release, +}; + +/* + * Create a new peer session in assigned state (connect will start automatically) + * It sets its context into appctx->svcctx. + */ +static struct appctx *sink_forward_session_create(struct sink *sink, struct sink_forward_target *sft) +{ + struct appctx *appctx; + struct applet *applet = &sink_forward_applet; + + if (sft->srv->log_proto == SRV_LOG_PROTO_OCTET_COUNTING) + applet = &sink_forward_oc_applet; + + appctx = appctx_new_here(applet, NULL); + if (!appctx) + goto out_close; + appctx->svcctx = (void *)sft; + + if (appctx_init(appctx) == -1) + goto out_free_appctx; + + return appctx; + + /* Error unrolling */ + out_free_appctx: + appctx_free_on_early_error(appctx); + out_close: + return NULL; +} + +/* + * Task to handle connctions to forward servers + */ +static struct task *process_sink_forward(struct task * task, void *context, unsigned int state) +{ + struct sink *sink = (struct sink *)context; + struct sink_forward_target *sft = sink->sft; + + task->expire = TICK_ETERNITY; + + if (!stopping) { + while (sft) { + HA_SPIN_LOCK(SFT_LOCK, &sft->lock); + /* if appctx is NULL, start a new session */ + if (!sft->appctx) + sft->appctx = sink_forward_session_create(sink, sft); + HA_SPIN_UNLOCK(SFT_LOCK, &sft->lock); + sft = sft->next; + } + } + else { + while (sft) { + HA_SPIN_LOCK(SFT_LOCK, &sft->lock); + /* awake applet to perform a clean close */ + if (sft->appctx) + appctx_wakeup(sft->appctx); + HA_SPIN_UNLOCK(SFT_LOCK, &sft->lock); + sft = sft->next; + } + } + + return task; +} +/* + * Init task to manage connctions to forward servers + * + * returns 0 in case of error. + */ +int sink_init_forward(struct sink *sink) +{ + sink->forward_task = task_new_anywhere(); + if (!sink->forward_task) + return 0; + + sink->forward_task->process = process_sink_forward; + sink->forward_task->context = (void *)sink; + sink->forward_sighandler = signal_register_task(0, sink->forward_task, 0); + task_wakeup(sink->forward_task, TASK_WOKEN_INIT); + return 1; +} + +/* This tries to rotate a file-backed ring, but only if it contains contents. + * This way empty rings will not cause backups to be overwritten and it's safe + * to reload multiple times. That's only best effort, failures are silently + * ignored. + */ +void sink_rotate_file_backed_ring(const char *name) +{ + struct ring ring; + char *oldback; + int ret; + int fd; + + fd = open(name, O_RDONLY); + if (fd < 0) + return; + + /* check for contents validity */ + ret = read(fd, &ring, sizeof(ring)); + close(fd); + + if (ret != sizeof(ring)) + goto rotate; + + /* contents are present, we want to keep them => rotate. Note that + * an empty ring buffer has one byte (the marker). + */ + if (ring.buf.data > 1) + goto rotate; + + /* nothing to keep, let's scratch the file and preserve the backup */ + return; + + rotate: + oldback = NULL; + memprintf(&oldback, "%s.bak", name); + if (oldback) { + /* try to rename any possibly existing ring file to + * ".bak" and delete remains of older ones. This will + * ensure we don't wipe useful debug info upon restart. + */ + unlink(oldback); + if (rename(name, oldback) < 0) + unlink(oldback); + ha_free(&oldback); + } +} + +/* + * Parse "ring" section and create corresponding sink buffer. + * + * The function returns 0 in success case, otherwise, it returns error + * flags. + */ +int cfg_parse_ring(const char *file, int linenum, char **args, int kwm) +{ + int err_code = 0; + const char *inv; + size_t size = BUFSIZE; + struct proxy *p; + + if (strcmp(args[0], "ring") == 0) { /* new ring section */ + if (!*args[1]) { + ha_alert("parsing [%s:%d] : missing ring name.\n", file, linenum); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + inv = invalid_char(args[1]); + if (inv) { + ha_alert("parsing [%s:%d] : invalid ring name '%s' (character '%c' is not permitted).\n", file, linenum, args[1], *inv); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + if (sink_find(args[1])) { + ha_alert("parsing [%s:%d] : sink named '%s' already exists.\n", file, linenum, args[1]); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + cfg_sink = sink_new_buf(args[1], args[1], LOG_FORMAT_RAW, size); + if (!cfg_sink || cfg_sink->type != SINK_TYPE_BUFFER) { + ha_alert("parsing [%s:%d] : unable to create a new sink buffer for ring '%s'.\n", file, linenum, args[1]); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + /* allocate new proxy to handle forwards */ + p = calloc(1, sizeof *p); + if (!p) { + ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + init_new_proxy(p); + sink_setup_proxy(p); + p->parent = cfg_sink; + p->id = strdup(args[1]); + p->conf.args.file = p->conf.file = strdup(file); + p->conf.args.line = p->conf.line = linenum; + cfg_sink->forward_px = p; + } + else if (strcmp(args[0], "size") == 0) { + if (!cfg_sink || (cfg_sink->type != SINK_TYPE_BUFFER)) { + ha_alert("parsing [%s:%d] : 'size' directive not usable with this type of sink.\n", file, linenum); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + size = atol(args[1]); + if (!size) { + ha_alert("parsing [%s:%d] : invalid size '%s' for new sink buffer.\n", file, linenum, args[1]); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + if (cfg_sink->store) { + ha_alert("parsing [%s:%d] : cannot resize an already mapped file, please specify 'size' before 'backing-file'.\n", file, linenum); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + if (size < cfg_sink->ctx.ring->buf.size) { + ha_warning("parsing [%s:%d] : ignoring new size '%llu' that is smaller than current size '%llu' for ring '%s'.\n", + file, linenum, (ullong)size, (ullong)cfg_sink->ctx.ring->buf.size, cfg_sink->name); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + if (!ring_resize(cfg_sink->ctx.ring, size)) { + ha_alert("parsing [%s:%d] : fail to set sink buffer size '%llu' for ring '%s'.\n", file, linenum, + (ullong)cfg_sink->ctx.ring->buf.size, cfg_sink->name); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + } + else if (strcmp(args[0], "backing-file") == 0) { + /* This tries to mmap file for size and to use it as a backing store + * for ring . Existing data are delete. NULL is returned on error. + */ + const char *backing = args[1]; + size_t size; + void *area; + int fd; + + if (!cfg_sink || (cfg_sink->type != SINK_TYPE_BUFFER)) { + ha_alert("parsing [%s:%d] : 'backing-file' only usable with existing rings.\n", file, linenum); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + if (cfg_sink->store) { + ha_alert("parsing [%s:%d] : 'backing-file' already specified for ring '%s' (was '%s').\n", file, linenum, cfg_sink->name, cfg_sink->store); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + /* let's check if the file exists and is not empty. That's the + * only condition under which we'll trigger a rotate, so that + * config checks, reloads, or restarts that don't emit anything + * do not rotate it again. + */ + sink_rotate_file_backed_ring(backing); + + fd = open(backing, O_RDWR | O_CREAT, 0600); + if (fd < 0) { + ha_alert("parsing [%s:%d] : cannot open backing-file '%s' for ring '%s': %s.\n", file, linenum, backing, cfg_sink->name, strerror(errno)); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + size = (cfg_sink->ctx.ring->buf.size + 4095UL) & -4096UL; + if (ftruncate(fd, size) != 0) { + close(fd); + ha_alert("parsing [%s:%d] : could not adjust size of backing-file for ring '%s': %s.\n", file, linenum, cfg_sink->name, strerror(errno)); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + area = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + if (area == MAP_FAILED) { + close(fd); + ha_alert("parsing [%s:%d] : failed to use '%s' as a backing file for ring '%s': %s.\n", file, linenum, backing, cfg_sink->name, strerror(errno)); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + /* we don't need the file anymore */ + close(fd); + cfg_sink->store = strdup(backing); + + /* never fails */ + ring_free(cfg_sink->ctx.ring); + cfg_sink->ctx.ring = ring_make_from_area(area, size); + } + else if (strcmp(args[0],"server") == 0) { + if (!cfg_sink || (cfg_sink->type != SINK_TYPE_BUFFER)) { + ha_alert("parsing [%s:%d] : unable to create server '%s'.\n", file, linenum, args[1]); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + err_code |= parse_server(file, linenum, args, cfg_sink->forward_px, NULL, + SRV_PARSE_PARSE_ADDR|SRV_PARSE_INITIAL_RESOLVE); + } + else if (strcmp(args[0],"timeout") == 0) { + if (!cfg_sink || !cfg_sink->forward_px) { + ha_alert("parsing [%s:%d] : unable to set timeout '%s'.\n", file, linenum, args[1]); + err_code |= ERR_ALERT | ERR_FATAL; + goto err; + } + + if (strcmp(args[1], "connect") == 0 || + strcmp(args[1], "server") == 0) { + const char *res; + unsigned int tout; + + if (!*args[2]) { + ha_alert("parsing [%s:%d] : '%s %s' expects